Gamma rays from the $N=Z-2\mathrm{}$ nucleus ${}^{50}\mathrm{Fe}$ have been observed, establishing the rotational ground state band up to the state $J^{\pi }{=11\mathrm{}}^{+}$ at 6.994 MeV excitation energy. The experimental Coulomb energy differences, obtained by comparison with the isobaric analog states in its mirror ${}^{50}\mathrm{Cr}$, confirm the qualitative interpretation of the backbending patterns in terms of successive alignments of proton and neutron pairs. A quantitative agreement with experiment has been achieved by exact shell model calculations, incorporating the differences in radii along the yrast bands, and properly renormalizing the Coulomb matrix elements in the $\mathrm{pf}$ model space.

Excited states have been studied in ${}^{35}\mathrm{Ar}$ following the ${}^{16}\mathrm{O}({}^{24}\mathrm{Mg},1\alpha 1n){}^{35}\mathrm{Ar}$ fusion-evaporation reaction at 60 MeV using the Ge-detector array GASP. A comparison with the mirror nucleus ${}^{35}\mathrm{Cl}$ shows two remarkable features: (i) A surprisingly large energy difference for the $13/2^{-}$ states, in which the hitherto overlooked electromagnetic spin-orbit term is shown to play a major role, and (ii) a very different decay pattern for the $7/2^{-}$ states, which provides direct evidence of isospin mixing.

The neutron-rich cobalt isotopes up to A=67 have been studied through multinucleon transfer reactions by bombarding a 238U target with a 460-MeV 70Zn beam. Unambiguous identification of prompt $\gamma${} rays belonging to each nucleus has been achieved using coincidence relationships with the ions detected in a high-acceptance magnetic spectrometer. The new data are discussed in terms of the systematics of the cobalt isotopes and interpreted with large-scale shell-model calculations in the fpgd model space. In particular, very different shapes can be described in 67Co, at the edge of the island of inversion at N=40, where a low-lying highly deformed band coexists with a spherical structure.

Following the heavy-ion fusion-evaporation reaction ${}^{32}\mathrm{S}+{}^{24}\mathrm{M}\mathrm{g}$ at 95 MeV beam energy the lifetimes of analogue states in the $T_z=\pm 1/2$ $A=51$ mirror nuclei ${}^{51}\mathrm{F}\mathrm{e}$ and ${}^{51}\mathrm{M}\mathrm{n}$ have been measured using the Cologne plunger device coupled to the GASP $\gamma$-ray spectrometer. The deduced $B(E2;27/2^{-}\to 23/2^{-})$ values afford a unique opportunity to probe isoscalar and isovector polarization charges and to derive effective proton and neutron charges, ${\epsilon }_p$ and ${\epsilon }_n$, in the $fp$ shell. A comparison between the experimental results and several different large-scale shell-model calculations yields ${\epsilon }_p\sim 1.15e$ and ${\epsilon }_n\sim 0.80e$.